Yacht Devices YDNU-02NF User Manual - Appendix А. Troubleshooting

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APPENDIX А. Troubleshooting

Situation

Possible cause and correction

LED does not signal when 

USB cable is connected

USB cable or USB port is damaged. Replace the cable and/or try  

to connect Device to another port.

All Device signals are red 

with 10-second interval

Device is powered on, but is not connected with a PC (drivers 

are not installed; device is disabled in PC settings; etc.). If you connected 

the Device to a new USB port, re-connect it to the port used previously. 

Please see chapter IV Table 1 for details.

PC software does not work  

as expected

Record diagnostics data (see chapter VIII) and send it with a PC software 

screenshot to technical support.

Application cannot open 

Device port; write and/or 

access errors when sending 

commands to Device

Check the LED signals. If Device signals that the port is already opened 

by an application, close all applications that can use the Device port.  

In Linux, check the modem manager settings (see III.4). In Linux  

and  Mac  OS  X,  be  sure  that  you  have  permissions  on  the  Device  port  

(see operation system manual).

Device does not accept 

operation mode commands

If the LED signals that port is already opened by an application,  

but you can open the Device’s port with the terminal or any program,  

this may mean that there is incorrect handling of the DTR signal by  

the PC software. Try the following commands (replace the port name  

with  your  own)  in  operation  mode  command  in  Windows,  Mac  OS  X, 

Linux:

•  MODE COM3 DTR=ON

•  stty -F /dev/cu.usbmodem00090001 hupcl

•  stty -F /dev/ttyACM1 hupcl